/**
* Get file types where mentioned validator
*
* @param AppConfig $config
* @return array
*/
public function getValidatorFileTypes(AppConfig $config)
{
if ($this->fileTypes === null) {
$nodes = $config->getNodesExpr(FileType::XPATH_FILE_TYPES);
$this->fileTypes = array_keys($nodes);
}
return $this->fileTypes;
}